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Investment Securities - Gross Unrealized Losses and Fair Value of Investments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Fair Value $ 11,602 $ 41,356
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses 50 490
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Fair Value 12,215 13,076
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses 168 335
Available-for-sale Securities, Gross unrealized losses, Fair Value 23,817 54,432
Available-for-sale Securities, Gross unrealized losses, Unrealized Losses 218 825
Held-to-maturity Securities, Gross unrealized losses, Less than Twelve Months, Fair Value   6,536
Held-to-maturity-Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses   30
Held-to-maturity Securities, Gross unrealized losses, Twelve Months or More, Fair Value   0
Held-to-maturity Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses   0
Held-to-maturity Securities, Gross unrealized losses, Fair Value   6,536
Held-to-maturity Securities, Gross unrealized losses, Unrealized Losses   30
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Fair Value   4,566
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses   55
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Fair Value 2,976 798
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses 56 16
Available-for-sale Securities, Gross unrealized losses, Fair Value 2,976 5,364
Available-for-sale Securities, Gross unrealized losses, Unrealized Losses 56 71
Held-to-maturity Securities, Gross unrealized losses, Less than Twelve Months, Fair Value   1,312
Held-to-maturity-Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses   20
Held-to-maturity Securities, Gross unrealized losses, Twelve Months or More, Fair Value   0
Held-to-maturity Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses   0
Held-to-maturity Securities, Gross unrealized losses, Fair Value   1,312
Held-to-maturity Securities, Gross unrealized losses, Unrealized Losses   20
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Fair Value 4,346 16,692
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses 15 128
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Fair Value 4,624 5,048
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses 52 60
Available-for-sale Securities, Gross unrealized losses, Fair Value 8,970 21,740
Available-for-sale Securities, Gross unrealized losses, Unrealized Losses 67 188
Held-to-maturity Securities, Gross unrealized losses, Less than Twelve Months, Fair Value   1,906
Held-to-maturity-Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses   5
Held-to-maturity Securities, Gross unrealized losses, Twelve Months or More, Fair Value   0
Held-to-maturity Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses   0
Held-to-maturity Securities, Gross unrealized losses, Fair Value   1,906
Held-to-maturity Securities, Gross unrealized losses, Unrealized Losses   5
Mortgage-backed Securities and CMO's [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Fair Value 7,256 15,620
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses 35 290
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Fair Value 4,615 7,230
Available-for-sale Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses 60 259
Available-for-sale Securities, Gross unrealized losses, Fair Value 11,871 22,850
Available-for-sale Securities, Gross unrealized losses, Unrealized Losses $ 95 549
State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Fair Value   465
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses   3
Available-for-sale Securities, Gross unrealized losses, Fair Value   465
Available-for-sale Securities, Gross unrealized losses, Unrealized Losses   3
Held-to-maturity Securities, Gross unrealized losses, Less than Twelve Months, Fair Value   3,318
Held-to-maturity-Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses   5
Held-to-maturity Securities, Gross unrealized losses, Twelve Months or More, Fair Value   0
Held-to-maturity Securities, Gross unrealized losses, Twelve Months or More, Unrealized Losses   0
Held-to-maturity Securities, Gross unrealized losses, Fair Value   3,318
Held-to-maturity Securities, Gross unrealized losses, Unrealized Losses   5
U.S. Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Fair Value   4,013
Available-for-sale Securities, Gross unrealized losses, Less than Twelve Months, Unrealized Losses   14
Available-for-sale Securities, Gross unrealized losses, Fair Value   4,013
Available-for-sale Securities, Gross unrealized losses, Unrealized Losses   $ 14